Mercurial > sdl-ios-xcode

comparison src/audio/amigaos/SDL_ahiaudio.c @ 0:74212992fb08

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
parents
children 75a95f82bc1f
comparison
equal deleted inserted replaced
-1:000000000000 0:74212992fb08
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with this library; if not, write to the Free
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 Sam Lantinga
20 5635-34 Springhouse Dr.
21 Pleasanton, CA 94588 (USA)
22 slouken@devolution.com
23 */
24
25 #ifdef SAVE_RCSID
26 static char rcsid =
27 "@(#) $Id$";
28 #endif
29
30 /* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */
31
32 #include "SDL_endian.h"
33 #include "SDL_audio.h"
34 #include "SDL_audiomem.h"
35 #include "SDL_audio_c.h"
36 #include "SDL_lowaudio.h"
37
38 /* Audio driver functions */
39 static int AHI_OpenAudio(_THIS, SDL_AudioSpec *spec);
40 static void AHI_WaitAudio(_THIS);
41 static void AHI_PlayAudio(_THIS);
42 static Uint8 *AHI_GetAudioBuf(_THIS);
43 static void AHI_CloseAudio(_THIS);
44
45 #ifndef __SASC
46 #define mymalloc(x) AllocVec(x,MEMF_PUBLIC)
47 #define myfree FreeVec
48 #else
49 #define mymalloc malloc
50 #define myfree free
51 #endif
52
53 /* Audio driver bootstrap functions */
54
55 static int Audio_Available(void)
56 {
57 #ifndef NO_AMIGADEBUG
58 D(bug("AHI available.\n"));
59 #endif
60
61 return 1;
62 }
63
64 static void Audio_DeleteDevice(SDL_AudioDevice *device)
65 {
66 free(device->hidden);
67 free(device);
68 }
69
70 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
71 {
72 SDL_AudioDevice *this;
73
74 #ifndef NO_AMIGADEBUG
75 D(bug("AHI created...\n"));
76 #endif
77
78 /* Initialize all variables that we clean on shutdown */
79 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
80 if ( this ) {
81 memset(this, 0, (sizeof *this));
82 this->hidden = (struct SDL_PrivateAudioData *)
83 malloc((sizeof *this->hidden));
84 }
85 if ( (this == NULL) || (this->hidden == NULL) ) {
86 SDL_OutOfMemory();
87 if ( this ) {
88 free(this);
89 }
90 return(0);
91 }
92 memset(this->hidden, 0, (sizeof *this->hidden));
93
94 /* Set the function pointers */
95 this->OpenAudio = AHI_OpenAudio;
96 this->WaitAudio = AHI_WaitAudio;
97 this->PlayAudio = AHI_PlayAudio;
98 this->GetAudioBuf = AHI_GetAudioBuf;
99 this->CloseAudio = AHI_CloseAudio;
100
101 this->free = Audio_DeleteDevice;
102
103 return this;
104 }
105
106 AudioBootStrap AHI_bootstrap = {
107 "AHI", Audio_Available, Audio_CreateDevice
108 };
109
110
111 void static AHI_WaitAudio(_THIS)
112 {
113 if(!CheckIO((struct IORequest *)audio_req[current_buffer]))
114 {
115 WaitIO((struct IORequest *)audio_req[current_buffer]);
116 // AbortIO((struct IORequest *)audio_req[current_buffer]);
117 }
118 }
119
120 static void AHI_PlayAudio(_THIS)
121 {
122 if(playing>1)
123 WaitIO((struct IORequest *)audio_req[current_buffer]);
124
125 /* Write the audio data out */
126 audio_req[current_buffer] -> ahir_Std. io_Message.mn_Node.ln_Pri = 60;
127 audio_req[current_buffer] -> ahir_Std. io_Data = mixbuf[current_buffer];
128 audio_req[current_buffer] -> ahir_Std. io_Length = this->spec.samples*this->hidden->bytespersample;
129 audio_req[current_buffer] -> ahir_Std. io_Offset = 0;
130 audio_req[current_buffer] -> ahir_Std . io_Command = CMD_WRITE;
131 audio_req[current_buffer] -> ahir_Frequency = this->hidden->freq;
132 audio_req[current_buffer] -> ahir_Volume = 0x10000;
133 audio_req[current_buffer] -> ahir_Type = this->hidden->type;
134 audio_req[current_buffer] -> ahir_Position = 0x8000;
135 audio_req[current_buffer] -> ahir_Link = (playing>0 ? audio_req[current_buffer^1] : NULL);
136
137 SendIO((struct IORequest *)audio_req[current_buffer]);
138 current_buffer^=1;
139
140 playing++;
141 }
142
143 static Uint8 *AHI_GetAudioBuf(_THIS)
144 {
145 return(mixbuf[current_buffer]);
146 }
147
148 static void AHI_CloseAudio(_THIS)
149 {
150 D(bug("Closing audio...\n"));
151
152 if ( mixbuf[0] != NULL ) {
153 myfree(mixbuf[0]);
154 // SDL_FreeAudioMem(mixbuf[0]);
155 mixbuf[0] = NULL;
156 }
157
158 if ( mixbuf[1] != NULL ) {
159 myfree(mixbuf[1]);
160 // SDL_FreeAudioMem(mixbuf[1]);
161 mixbuf[1] = NULL;
162 }
163
164 playing=0;
165
166 if(audio_req[0])
167 {
168 if(audio_req[1])
169 {
170 if(!CheckIO((struct IORequest *)audio_req[1]))
171 {
172 AbortIO((struct IORequest *)audio_req[1]);
173 WaitIO((struct IORequest *)audio_req[1]);
174 }
175 myfree(audio_req[1]);
176 }
177
178 if(!CheckIO((struct IORequest *)audio_req[0]))
179 {
180 AbortIO((struct IORequest *)audio_req[0]);
181 WaitIO((struct IORequest *)audio_req[0]);
182 }
183
184 CloseDevice((struct IORequest *)audio_req[0]);
185 DeleteIORequest((struct IORequest *)audio_req[0]);
186 audio_req[0]=audio_req[1]=NULL;
187 }
188
189 if ( audio_port != NULL ) {
190 DeleteMsgPort(audio_port);
191 audio_port = NULL;
192 }
193 D(bug("...done!\n"));
194 }
195
196 static int AHI_OpenAudio(_THIS, SDL_AudioSpec *spec)
197 {
198 // int width;
199
200 D(bug("AHI opening...\n"));
201
202 /* Determine the audio parameters from the AudioSpec */
203 switch ( spec->format & 0xFF ) {
204
205 case 8: { /* Signed 8 bit audio data */
206 D(bug("Samples a 8 bit...\n"));
207 spec->format = AUDIO_S8;
208 this->hidden->bytespersample=1;
209 this->hidden->type = AHIST_M8S;
210
211 }
212 break;
213
214 case 16: { /* Signed 16 bit audio data */
215 D(bug("Samples a 16 bit...\n"));
216 spec->format = AUDIO_S16MSB;
217 this->hidden->bytespersample=2;
218 this->hidden->type = AHIST_M16S;
219 }
220 break;
221
222 default: {
223 SDL_SetError("Unsupported audio format");
224 return(-1);
225 }
226 }
227
228 D(bug("Before CalculateAudioSpec\n"));
229 /* Update the fragment size as size in bytes */
230 SDL_CalculateAudioSpec(spec);
231
232 D(bug("Before CreateMsgPort\n"));
233
234 if(!(audio_port=CreateMsgPort()))
235 {
236 SDL_SetError("Unable to create a MsgPort");
237 return -1;
238 }
239
240 D(bug("Before CreateIORequest\n"));
241
242 if(!(audio_req[0]=(struct AHIRequest *)CreateIORequest(audio_port,sizeof(struct AHIRequest))))
243 {
244 SDL_SetError("Unable to create an AHIRequest");
245 DeleteMsgPort(audio_port);
246 return -1;
247 }
248
249 audio_req[0]->ahir_Version = 4;
250
251 if(OpenDevice(AHINAME,0,(struct IORequest *)audio_req[0],NULL))
252 {
253 SDL_SetError("Unable to open AHI device!\n");
254 DeleteIORequest((struct IORequest *)audio_req[0]);
255 DeleteMsgPort(audio_port);
256 return -1;
257 }
258
259 D(bug("AFTER opendevice\n"));
260
261 /* Set output frequency */
262 this->hidden->freq = spec->freq;
263
264 D(bug("Before buffer allocation\n"));
265
266 /* Allocate mixing buffer */
267 mixbuf[0] = (Uint8 *)mymalloc(spec->size);
268 mixbuf[1] = (Uint8 *)mymalloc(spec->size);
269
270 D(bug("Before audio_req allocation\n"));
271
272 if(!(audio_req[1]=mymalloc(sizeof(struct AHIRequest))))
273 {
274 SDL_OutOfMemory();
275 return(-1);
276 }
277
278 D(bug("Before audio_req memcpy\n"));
279
280 memcpy(audio_req[1],audio_req[0],sizeof(struct AHIRequest));
281
282 if ( mixbuf[0] == NULL || mixbuf[1] == NULL ) {
283 SDL_OutOfMemory();
284 return(-1);
285 }
286
287 D(bug("Before mixbuf memset\n"));
288
289 memset(mixbuf[0], spec->silence, spec->size);
290 memset(mixbuf[1], spec->silence, spec->size);
291
292 current_buffer=0;
293 playing=0;
294
295 D(bug("AHI opened: freq:%ld mixbuf:%lx/%lx buflen:%ld bits:%ld\n",spec->freq,mixbuf[0],mixbuf[1],spec->size,this->hidden->bytespersample*8));
296
297 /* We're ready to rock and roll. :-) */
298 return(0);
299 }